I have observed the area after trawlers have worked all night from a boat & from the air & I found cartons floating around, beer cans, cigarette packets, oil slicks etc & to top it all off the mud & silt took all of the next day to settle & then the cycle started again at 6 pm. That was in area totally out of the way where no-ne actually goes besides the trawlers, an area so remote that no tourist boats have ever been to until this day yet the impact of commercialsim is ever-present.
The good people who do nothing want their prawns & fish so there you go. But, the good people who do no harm blame the commercial operators for damaging the environment & hand out hefty fines to the operators. So, the operators then go at it even harder to cover the cost of the fines. Does anyone really give a crap about the environment ? Well, it seems the good people who do nothing do as long as someone else makes the effort at someone else's expense.